Mock up cylinder heads for our patent pending SoloSwap SBC mock up engine. Laser cut and formed from 12-gauge steel, just like the SoloSwap short block. Accepts all factory and aftermarket bolt-on valve covers, headers, and intakes. Perfect addition to our SoloSwap small block Fits Chevy mock up engine short block. Not designed to mount to actual SBC engine blocks without modifications. Add Our Mock Up Cylinder Heads to Your Existing SoloSwap Short Block Our SoloSwap mock up engine blocks are a great resource for individual builders as well as shops looking to make engine swaps easier. They provide a lightweight solution to mocking up the engine in a car that never had said engine type from the factory. Though offered in both short block and long block variants for mock up engine purposes, many of our customers purchasing the short block version of our patent pending SoloSwap mock up block have asked us to offer the long block’s mock up cylinder heads separately for use on the SoloSwap short block replica engines customers already own. We heard you loud and clear and you can now purchase our SoloSwap mock up long block cylinder heads separately. Small Block Fits Chevy Mock Up Cylinder Heads Provide Complete Long Block Mock Up Needs Our SoloSwap SBC cylinder heads come directly from our long block mock up engine block replica engines product. Meaning that these mock up cylinder heads will bolt directly to the mock up engine short block you already own with zero modifications, unlike plastic engines where the heads are molded directly into the long block plastic engine block. These mock up cylinder heads are not designed to bolt to actual production cylinder block castings, though with some modifications to the mounting bolt hole diameter and using the properly sized hardware, it may be possible to bolt these mock up heads to a production cylinder block casting if you wish. These are also not compatible with a foam engine block either